Abstract
The principal need for a dynamic fracture tests is to define the ductile-brittle transition in the fracture resistance of conventional ferritic steels and irons as a function of temperature and size. Dynamic criteria of fracture resistance have also been used for structural metals with a limited sensitivity to strain rate due to the economy of conducting an impact test. Because of the general availability of impact machines for conducting a Charpy test, much research effort has been expended on attempts to make that test a more quantitative tool. For some materials, Charpy test results are difficult to interpret, and new tests have been developed and standardized that more readily provide information related to structural performance. Modified Charpy tests, the Drop-Weight NDT test, the Drop-Weight Tear test, and the Dynamic Tear test are discussed with respect to their attributes and their limitations.
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